Vabiable-stboke x o operating mechanism sos estgihes



T. H. VAN DYKE. VARXABLE ST ROKE OPERATING MECHANISM FOR ENGINES.

- APPLICATION FILED MAR.18,I919.

Patented June 17, 1919.

NVENTOR W wkz/mw fl' v mu h6g9 ATTORNEY nrir ' s res;

THOMAS H. VAN DYKE, OF KANSAS CITY,

' Specification of Letters Patent.

Application filed March 18, 1919. Serial No. 283,365.

To all whom it may concern:

Be it known that I, THOMAS H. VAN Dyna, a citizen of the United States,residing at Kansas "City, in the county ofJackson and State of Missouri,have invented a certain. new and useful Improvement in Variable-StrokeOperating Mechanism for Engines, of which the following is aspecification.

My invention relates to explosive engines.

One of the objects of my invention is to provide novel means forconnecting the crank shaft and connecting rod of an explosive engine bywhich the piston during the initial part of its outstroke and the latterpart of its instroke travels at a greater -ate of. speed improvements in.than would he the case if the connectin rod were pivoted in the usualmanner directly to the c ank shaft, thereby allording a maxh mumcompression of the charge, and utilizing a. maximum amount of theexplosive force of the charge.

My invention provides further a simple construction, which is cheap tomanufacture, easily assembled, not liable to excessive wear, and whichis durable and not liable to get out of order.

The novel features of my invention are hereinafter fully described andclaimed.

In the accompanying drawing, which illustrates the preferred embodimentof my invention,

Figure 1 is a view partly in elevation and partly in longitudinalvertical section of a iorizontal explosive engine provided with myin'ipri'ivement.

Fig. 2 is a top view of the same.

Fig. 3 is a diagrammatic representation of the path traveled by the pinwhich connects the connecting rod with the member which is pivoted tothe crank shaft.

Similar reference characters designate similar parts in the differentviews.

1 designates a rociprocative piston of an explosive engineQ of theordinary horizontal type and 3 the crank shaft provided with the usualcrank i. I

5 designates a horizontal lJZIL disposed at the side of the shaft 3which is distant from the piston 1 and which is mounted in upwardly andrearwardly extending hearings ti on the engine base 7. 8 designates twolovers pivoted n the bar 5 and pivoted by a transverse pin Bto one endof a connecting member 10, the other end of which is pivoted by atransverse pin 11 to the outerzcud of the usual connecting rod 12, whichis pivoted in the usual manner to the pistonl.

The connecting member 10 has mounted;

on it a bearing plate 13 between which and the connecting member ispivoted the crank l. The crank l is pivoted to the member 10intermediate of the pins 9 and 11. which constitute with the crank itthree pivotal points which are lined relatively to each other. 3-

reason or the construction which has been described, the piston 1travels faster during the initialpart of its outstroke andtlie latter.part of its instroke than would be the case if the connecting rod 1)were pivoted in the usual manner directly to the crank l. 'lhiSpermitsutilizing to the fullest extent the explosive, force of the chafge, andallords a maximum compression.

In the operation of the engine, when the charge is exploded the pistonstarts outward at high speed, thus preventing loss (it power by leakageand ra( iation or conduction away of heat. The piston 3. travels thefull outstroke before the crank shaft- 3 has made a halt revolution. Asshown in dotted lines in l, the piston 1 has reached the outer limit ofits stroke at the time the, crank 4 has made only about one third of arevolution. During the instroke the piston travels slowly until near thelatter part of the stroke at which time it travels more rapidly than itthe connecting rod 12 were pivoted directly to the crank 4. Thus whencompression is hi 'h the piston l traveling at a relatively nigh rate ofspeed, thus preventing the loss of pressure by leakage and thus greatlyadding to the ell ieucy ol' the engine.

The piston travels the instroko during the time that the crank t ismaking" the remainin two thirds ot a revolution.

ed directly to the crank.

' travel 0 Owing to the, speed of the piston on its outward stroke, theexplodingcharge does not have. tin'ie to lose much heat to the cylinderand piston and these parts do not become so highly heated as in theordinary construction in which the comiecting rod is connectl or thesereasons it is not necessary to employ a water jacket or other specialcooling arrangement for the cylinder. I

in l i is a representation of the iath ot the pin ll durinea revolutionoi the crank shaft, the path being denoted by the line 14. The lines aand b designate on shown in solid and dotted lines respectively in Fig.l.

I do not limit my invention to the structure shown and described, asvarious modifications, within the scope of the appended claims, may bemade without departing from the spirit of my invention.

' What I claim is 1. In an explosive engine, the combination with apiston, connecting rod and crank shaft, of alever pivoted at a fixedpoint, and a connecting member-pivoted to the connecting rod and leverat two points fixed relatively to each other, and pivoted to the crankshaft.

2. In an explosive engine, the combination with a piston, connecting rodand crank shaft, of a lever pivoted at a fixed point,

and a connecting member pivoted to the connecting rod and lever at twopoints respectively .which'are fixed relatively to each other, an dpivoted to the crank shaft inter-' mediate of said two points.

3. In an explosive engine, the combination With a piston, connecting rodand crank shaft, of a leverv pivoted at a fixed pbint located at theside of the crank shaft distant from the piston, and a connecting memberpivoted at three points, fixed relatively to each other, to theconnecting rod, crank shaft and lever respectively, the pivotalconnectionof said member to said crank the crank shaft. of meansconnecting the crank of the crank shaft and connecting red by which theyare held a uniform distance apart, and by which the piston completes itsoutstroke before the crankshaft has made a half a revolution.

In an explosive engine, the combination with a piston, connecting rodand crank shaft, of means connecting the crank of the crankshaft and theconnecting rod by which they are held a uniform distance apart and bywhich the piston during the initial part of its ontstroke and during thelatter part of its instroke travels more rapidly than it would with-theconnecting rod pivoted directly. to the crank.

6; In an explosive engine, the combination with a piston, connecting rodand crank shaft, of means connecting the crank of the crank shaft and.the connecting red by which the piston during the initial part of itsoutstroke and the latter part of its instroke travels more rapidly thanit would with the connecting rod pivoted directly to the crank.

.In testimony whereof I have signed my name to this specification.

THOMAS H. VAN more.

